<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>绝对定位-父级有定位</title>
    <style>
      .grandfather {
        /* 如果父级元素无定位，爷级元素有定位，则以爷元素的位置做偏移的参考点 */
        position: relative;
        width: 800px;
        height: 800px;
        background-color: hotpink;
        padding: 50px;
      }
      .father {
        /* 如果父级元素有定位，则以父元素的位置做偏移的参考点 */
        /* position: relative; */
        width: 500px;
        height: 500px;
        background-color: skyblue;
      }
      .son {
        position: absolute;
        left: 30px;
        bottom: 10px;
        width: 200px;
        height: 200px;
        background-color: pink;
      }
    </style>
  </head>
  <body>
    <div class="grandfather">
      <div class="father">
        <div class="son"></div>
      </div>
    </div>
  </body>
</html>
